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<html lang="zh-cn">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>公共选择器</title>
    <style>
        #li {
            color: #123456;
        }
        
        #liu {
            color: #654321;
        }
        
        #li,
        #liu {
            font-size: 100px;
        }
    </style>
</head>

<body>
    <p id="li">李昊哲</p>
    <p id="liu">刘晓兰</p>
</body>

</html>